Simple models for power optimization across transmission, equalization and decoding

This paper provides simplistic models for optimization over transmit, equalization, and decoding power in a communication system for a given attainable rate, bandwidth, error-probability, and the channel taps between the transmitter and the receiver. For equalization, we focus on the digital feedback equalizer (DFE) and observe that the number of taps equalized should increase with the transmit power, and characterize the regime to where additional available power should be invested in transmission or equalization. For decoding, we focus on the message-passing decoder for any code, and provide a model for power consumed in the computational nodes and interconnects of the decoder, using which we formulate an optimization problem to minimize the total power consumed in transmission, equalization, and decoding.